I have a 2015 Toyota Camry and the other day on my way home from work, the AbS and traction control and brake light all came on... Today, I took it down to the shop and they said it was the following codes:

PO504
PO1604
P1605

But they could not find anything wrong with my car, but suggested to take it to the Toyota for further analysis, but the thing is, when I drove it down to the auto repair, they lights never came back on... So I am confused.